名词
中文翻译：索引
同义词：
['key', 'reference point', 'pointer']
例句：
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1. The index of the stock market has been rising steadily for the past few weeks.
过去几周，股市的指数一直在稳步上升。
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2. The index of the economy is closely watched by economists around the world.
经济指数受到全世界经济学家的密切关注。
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3. The index of happiness is a measure of how people feel about their lives.
幸福指数是衡量人们对自己生活感觉的一个指标。